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JAKE GYLLENHAAL and rapper-turned-actor 50 CENT were NOT pulling punches on the set of their new boxing flick “Southpaw” when “Fitty” – once a real-life street fighter/drug dealer – started jeering nastily at Jake’s boxing moves, then climbed into the ring to give him some “friendly” pointers and…POW-BAM-SMASH!...the dueling duo abruptly started boxing for REAL!
Said My SpyWitness: “50 Cent – who hangs out in boxer FLOYD MAYWEATHER JR.’s entourage – plays a boxing promoter in the film, and at one point he started offering Jake some ‘friendly’ off-screen advice on how to play a professional boxer.